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Volume 14, Number 1—January 2008


Telephone Survey to Assess Influenza-like Illness, United States, 2006

Joseph L. Malone*Comments to Author , Mohammad Madjid†, and S. Ward Casscells*‡
Author affiliations: *University of Texas Health Science Center, Houston, Texas, USA; †Texas Heart Institute, Houston, Texas, USA; ‡St. Luke’s Episcopal Hospital, Houston, Texas, USA

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Table 4

Health status information for patients answering “yes” to “Do you have the flu?” and possible risk factors for pandemic influenza illness, United States, 2006

Influenza surveillance system
Data reported
Survey date†
29 Apr 2006 (wk 17)
20 May 2006 (wk 20)
14 Oct 2006 (week 41)
Sentinel Provider Network (SPN)Outpatient visitsILI rate = 1.2% (<2.2% national baseline)ILI rate = 0.9% (<2.2% national baseline)ILI rate =1.2% (<2.1% national baseline)
Emerging Infections Program (EIP)
Laboratory-confirmed influenza hospitalizations of children <18 years of age
1.08/10,000 (cumulative)
Not reported
New Vaccine Surveillance Network (NVSN)
Laboratory-confirmed influenza-associated hospitalizations of children <5 years of age
4.3/10,000 (cumulative)
Not reported
122 Cities Mortality Reporting System
Pneumonia and influenza deaths compared with all causes of death
7.1% < threshold 7.8%
6.3% < threshold 7.4%
5.6% < threshold 6.38%
National Notifiable Disease Surveillance System
Seasonal influenza-associated pediatric deaths reported by all state health departments
State and Territorial Epidemiologists Report
State-level assessments of influenza activity
Regional activity in 3 states (KY, NY, CT); focal activity in 4 states (HI, ME, MA, PA) and District of Columbia; sporadic or no activity in 48 states
Sporadic activity in 25 states; no Activity in 25 states
Local activity in 2 states (AL, HI); sporadic activity in 6 states (CA, ID, TX, FL, LA, NE); no activity in 43 states
National Respiratory and Enteric Virus Surveillance System
Predominant circulating virus
Influenza B
Influenza B
Influenza A
US WHO and Global Influenza Surveillance Network; National Respiratory and Enteric Virus Surveillance System (NREVSS)Percentage of laboratory specimens positive and ILI positive for influenza virus9.46.31.0

*CDC, Centers for Disease Control and Prevention; ILI, influenza-like illness as defined by CDC (6,12); WHO, World Health Organization.
†Weeks 23, 30, 33, and 37 data were not available because CDC reported results only through week 20 in the 2005–06 influenza season and began reporting results on week 40 in the 2006–07 influenza season. The last day of the CDC week reports vary by several days from the last day of the survey results reported in Tables 3 and 4.

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